Valmiki Ramayana Aranya Kanda Sarga 11 Shloka 61
Original Shlokaब्राह्माणानां सहस्राणि तैरेवं कामरूपिभिः।।3.11.61।। विनाशितानि संहत्य नित्यशः पिशिताशनैः।
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परन्तप O subduer of enemies, ताभ्याम् by both, संहत्य after killing, पिशिताशनैः by those carnivorous, ब्राह्मणानाम् brahmins, सहस्राणि in thousands, एवम् in that way, नित्यशः daily, विनाशितानि killed, तैः कामरूपिभिः by them assuming any form at will.
In this manner, thousands of brahmins used to be killed daily by those carnivorous demons who assumed any form at their free will.